不同牙冠高度与全冠固位力关系的实验分析  

The experimental study of the relationship between preparation height and retention of complete crowns

作　　者：陈丽萍[1] 华楠[1] 葛艳[1] 庄晶[1] 钱琼[1] 

机构地区：[1]上海第二医科大学附属第九人民医院口腔医学院口腔修复科,上海200011

出　　处：《上海口腔医学》2004年第4期308-311,共4页Shanghai Journal of Stomatology

摘　　要：目的:探讨冠的高度对固位力的影响,为低矮后牙冠的固位提供理论依据。方法:本实验在不使用粘结剂的情况下,制作2mm、3mm、4mm、5mm四种高度,内聚角为零度的金属牙体模型,并在其上制作金属和树脂冠,然后进行冠的固位力测定,采用t检验比较各组数据之间的差异。结果:冠高度与固位力成正比;因内聚角为零,即使2mm高度牙体的冠也有固位力。结论:牙冠高度低,相应冠的固位力小。对于低矮的后牙冠,牙备时应适当减少内聚角度,以获得足够的固位力。PURPOSE: This study was to discuss the influence of preparation height on retention of complete crown. METHODS: In this study we measured the retention of complete crown with the preparation height 2mm, 3mm, 4mm and 5mm. All crowns had no preparation taper and no bonding agent was used.The retention of crowns was measured and the data was statistically analyzed by t test. RESULTS: The preparation height was directly proportional to the retention of complete crown. And the crown with the height of 2mm had enough retention when the crown had no preparation taper. CONCLUSION: In order to get enough retention of short height molar, we should induce the preparation taper.

关 键 词：全冠 冠高度 固位力 内聚角 

分 类 号：R783.4[医药卫生—口腔医学]